CN111537241B - Vehicle braking performance evaluation method - Google Patents
Vehicle braking performance evaluation method Download PDFInfo
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- CN111537241B CN111537241B CN202010397427.5A CN202010397427A CN111537241B CN 111537241 B CN111537241 B CN 111537241B CN 202010397427 A CN202010397427 A CN 202010397427A CN 111537241 B CN111537241 B CN 111537241B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a vehicle braking performance evaluation method, which comprises the following steps: when a vehicle is subjected to a braking test, acquiring braking test parameters, attitude response parameters and internal parameters of a braking system of the vehicle in a period from the beginning of braking to the stopping of the vehicle; establishing a corresponding relation between braking test parameters, attitude parameters and internal parameters of a braking system and time; and quantitatively evaluating the braking performance of the vehicle based on the corresponding relation of the braking test parameters, the attitude parameters and the internal parameters of the braking system at the same moment. The method can smoothly obtain the interrelation among the braking performance of the vehicle, the braking test parameters of the vehicle and the internal parameters of the braking system of the vehicle, and further provides important data support and improvement basis for the overall improvement of the braking performance of the vehicle in the future.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle braking performance evaluation method.
Background
In order to make the braking performance of the vehicle reach the optimal state, the braking system of the vehicle needs to be tested in the vehicle development process or before the vehicle leaves a factory, so as to obtain the braking performance of the vehicle, and then the vehicle is debugged, so that the braking performance of the vehicle is adjusted to the optimal state. Especially, in the process of developing the braking performance of the vehicle, the performance parameters of the whole vehicle are more, the performance parameters of the whole vehicle have conflict and contradiction, it is difficult to accurately calibrate each performance parameter of the whole vehicle, and if the performance parameters of the whole vehicle are not calibrated well, the braking performance of the vehicle can be greatly influenced.
Disclosure of Invention
The embodiment of the invention provides a vehicle braking performance evaluation method, which aims to solve the problem that performance parameters of a vehicle involved in a vehicle braking test process are difficult to calibrate.
In a first aspect, an embodiment of the present invention provides a vehicle braking performance evaluation method, including the following steps:
collecting brake test parameters, attitude response parameters and internal parameters of a brake system of a vehicle in a period from the start of braking to the stop of the vehicle when the vehicle performs a brake test;
establishing a corresponding relation among the brake test parameters, the attitude parameters and the internal parameters of the brake system and time; and
and quantitatively evaluating the braking performance of the vehicle based on the corresponding relation of the braking test parameters, the attitude parameters and the internal parameters of the braking system at the same moment.
Optionally, the brake test parameter includes at least one of a state parameter and an environmental site parameter, the attitude response parameter includes at least one of a pitch angle, a vertical height variation of the front suspension, and a vertical height variation of the rear suspension, and the internal parameter of the brake system includes at least one of a brake deceleration, a brake pedal force, a wheel cylinder pressure, and a total cylinder pressure.
Optionally, the step of collecting the braking test parameters, the attitude response parameters and the internal parameters of the braking system during a period from the start of braking to the stop of the vehicle when the vehicle performs the braking test includes:
detecting at least one of a pitch angle, a pitch angle angular velocity, a vehicle body roll angle angular velocity, a vehicle body yaw angle and a vehicle body yaw angular velocity of the vehicle through a gyroscope; and/or
Detecting, by an altimeter system, an amount of height change of a front suspension and/or an amount of height change of a rear suspension of the vehicle in a vertical direction.
Optionally, before the step of performing the braking test on the vehicle, the method further includes:
and carrying out a brake preheating test on the vehicle so as to enable a brake system of the vehicle to reach a working state of a preset standard.
Optionally, the step of performing a brake warm-up test on the vehicle includes:
and enabling the vehicle to run at a preset initial speed and a preset braking deceleration until relevant structural members of a braking system of the vehicle reach a preset standard state.
Optionally, the step of performing a braking test on the vehicle includes:
accelerating the running vehicle to a first preset speed;
releasing an accelerator pedal of the vehicle to keep the vehicle coasting at a reduced speed; and
when the speed of the vehicle is reduced from the first preset speed to a second preset speed, increasing a brake pedal force applied to a brake pedal of the vehicle until the vehicle stops.
Optionally, the step of performing the braking test on the vehicle further includes:
triggering an automatic control system of a brake system of the vehicle to operate before the speed of the vehicle is reduced from the second preset speed to a third preset speed.
Optionally, when the vehicle is a manual transmission vehicle, the step of releasing an accelerator pedal of the vehicle to keep the vehicle coasting in a decelerating state comprises:
and performing the operation of releasing an accelerator pedal of the vehicle to keep the vehicle in deceleration and coasting when the vehicle is in the neutral state.
Optionally, when the vehicle is an automatic transmission vehicle, the step of releasing an accelerator pedal of the vehicle to keep the vehicle coasting at a reduced speed includes:
and respectively executing the operation of releasing an accelerator pedal of the vehicle to keep the vehicle in deceleration and coasting when the vehicle is in a neutral gear state and a driving gear state.
Optionally, before performing the braking test of the vehicle, the method further includes:
and checking whether the state of the vehicle meets the requirement of a braking test in advance.
Compared with the prior art, the vehicle braking performance evaluation method provided by the invention at least has the following beneficial effects:
the method comprises the steps of firstly, collecting brake test parameters, attitude response parameters and internal parameters of a brake system of a vehicle in a period from the start of braking to the stop of the vehicle when the vehicle is subjected to a brake test; and finally, quantitatively evaluating the braking performance of the vehicle based on the corresponding relation of the braking test parameters, the attitude parameters and the internal parameters of the braking system at the same moment, so that the mutual relation among the braking performance of the vehicle, the braking test parameters of the vehicle and the internal parameters of the braking system of the vehicle can be smoothly obtained, and further important data support and improvement basis are provided for the overall improvement of the braking performance of the vehicle in the future.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flow chart of a vehicle braking performance evaluation method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and the like, herein does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships are changed accordingly.
Referring to fig. 1, an embodiment of the present invention provides a vehicle braking performance evaluation method, including the steps of:
s100, when the vehicle is subjected to a braking test, acquiring braking test parameters, attitude response parameters and internal parameters of a braking system of the vehicle in a period from the beginning of braking to the stopping of the vehicle.
In one embodiment, the brake test parameters include at least one of state parameters and environmental site parameters, the attitude response parameters include at least one of pitch angle, amount of vertical change in front suspension height, and amount of vertical change in rear suspension height, and the internal parameters of the braking system include at least one of brake deceleration, brake pedal force, slave cylinder pressure, and master cylinder pressure.
S200, establishing a corresponding relation among the braking test parameters, the attitude parameters, the internal parameters of the braking system and time.
And S300, quantitatively evaluating the braking performance of the vehicle based on the corresponding relation of the braking test parameters, the attitude parameters and the internal parameters of the braking system at the same moment.
The method for evaluating the braking performance of the vehicle comprises the steps of firstly, acquiring braking test parameters, attitude response parameters and internal parameters of a braking system of the vehicle in a period from the braking start to the vehicle stop when the vehicle is subjected to a braking test; then, the corresponding relation between the brake test parameters, the attitude parameters and the internal parameters of the brake system and the time is established, and finally, the brake performance of the vehicle is quantitatively evaluated based on the corresponding relation of the brake test parameters, the attitude parameters and the internal parameters of the brake system at the same moment, so that the mutual relation between the brake performance of the vehicle and the brake test parameters of the vehicle and the internal parameters of the brake system of the vehicle can be smoothly obtained, and further important data support and improvement basis is provided for the overall improvement of the brake performance of the vehicle in the future.
In one embodiment, all the collected parameters of the vehicle can be plotted on the same coordinate system (for example, a common horizontal axis-time axis) to more clearly display the relationship and the variation trend among the parameters of the vehicle on the same time axis; in one embodiment, all of the collected parameters of the vehicle may be transmitted to the terminal device for curve plotting.
In one embodiment, the braking system of the vehicle may be, but is not limited to, an ABS system (anti-lock braking system), and in one embodiment, the condition parameter of the vehicle includes at least one of a number of miles driven by the vehicle, a number of service brakes, a loading rating, a wheel loading quality, a wheel alignment parameter, a skid depth of a wheel tire, and a wheel tire air pressure. In one embodiment, the wheel load mass of the vehicle can be detected by a wheel load meter; in one embodiment, the tire pressure of the wheel of the vehicle may be detected by a tire pressure gauge.
In one embodiment, the environmental site parameter of the vehicle comprises at least one of a site atmospheric temperature, a site atmospheric pressure, a site wind speed, a site grade, and a site road surface condition; in one embodiment, at least one of a field atmospheric temperature, a field air pressure, and a field wind speed of the vehicle may be detected by the handheld weather station.
In one embodiment, the speed and/or braking deceleration of the vehicle may be detected by a braking data acquisition system; in an embodiment, the amount of change in height of the front suspension and/or the amount of change in height of the rear suspension of the vehicle in the vertical direction may be detected by an altimeter system.
In one embodiment, a brake pedal force applied to a brake pedal of a brake system of a vehicle may be detected by a pedal force sensor; in one embodiment, the partial pump pressure and/or the total pump pressure of the brake system of the vehicle may be detected by a line pressure sensor; in one embodiment, at least one of a pitch angle, a pitch angle angular velocity, a body roll angle angular velocity, a body yaw angle, and a body yaw angular velocity of the vehicle may be detected by a gyroscope.
In one embodiment, before performing the braking test of the vehicle, the method further comprises: step S101, an environment field with an environment condition meeting the braking test requirement of the vehicle is selected in advance, so that the interference of the environment field on the braking test of the vehicle is overcome. In one embodiment, the environmental site may be dry, flat and clean, the site pavement may be paved with cement concrete or asphalt and have good adhesion, the gradient of the site is not more than 2%, the wind speed of the site is not more than 2m/s, and the atmospheric temperature of the site is between 0 ℃ and 40 ℃.
In one embodiment, before performing the braking test of the vehicle, the method further comprises: step S102, the state of the vehicle is checked in advance whether the state meets the requirement of the braking test. Specifically, in one embodiment, the requirements to be met by the vehicle for the braking test include that the number of the traveled mileage of the vehicle exceeds 3000km, the depth of the skid-proof pattern of the wheel tire of the vehicle exceeds 3mm, the use state of the vehicle is not abnormal, and the loading mass of the vehicle is half of the rated loading mass of the vehicle; in one embodiment, if the vehicle is a new off-line vehicle, the requirement to be met by the vehicle includes that the number of normal service brakes of the vehicle reaches 100 times.
In one embodiment, before the step of performing the braking test on the vehicle, the method further comprises: and step S103, performing a brake preheating test on the vehicle to enable a brake system of the vehicle to reach a working state of a preset standard.
Specifically, the vehicle may be caused to travel at a preset initial speed, a preset braking deceleration, until relevant structural components of a braking system of the vehicle reach a preset standard state.
In one embodiment, the predetermined initial speed of the vehicle may be, but is not limited to, 100km/h, the predetermined deceleration of the vehicleMay be, but is not limited to, 0.6 g (i.e., 0.6 m/s 10 m/s) 2 ＝6m/s 2 ) The vehicle is decelerated at 6m/s at an initial speed of 100km/h and a braking deceleration 2 The driving is carried out until the average temperature of the brake linings, the brake disc or the brake drum of the brake system of the vehicle is kept between 65 ℃ and 100 ℃.
In one embodiment, the accuracy, reliability and authenticity of finally obtained corresponding parameter data of the vehicle can be ensured by performing a plurality of braking tests on the vehicle, recording corresponding parameters of the vehicle acquired during each braking test of the vehicle, and then taking an average value of the corresponding parameter data of the vehicle corresponding to the plurality of braking tests of the vehicle as a calibration result.
In one embodiment, the step of performing a braking test of the vehicle comprises: and S110, accelerating the running vehicle to a first preset speed. And S120, releasing an accelerator pedal of the vehicle to enable the vehicle to keep decelerating and sliding. And S130, when the speed of the vehicle is reduced from the first preset speed to the second preset speed, increasing the brake pedal force applied to the brake pedal of the vehicle until the vehicle stops. Further, the step of performing the braking test for the vehicle further comprises: and S140, triggering an automatic control system of a braking system of the vehicle to operate before the speed of the vehicle is reduced from the second preset speed to a third preset speed. In one embodiment, the first predetermined speed may be, but is not limited to, 100km/h, the second predetermined speed may be, but is not limited to, 80km/h, and the third predetermined speed may be, but is not limited to, 20km/h.
In one embodiment, when the vehicle is a manual transmission vehicle, the step S120 of releasing the accelerator pedal of the vehicle to keep the vehicle coasting at a reduced speed includes: and S122, when the vehicle is in a neutral gear (N gear), the vehicle is kept in deceleration and coasting by releasing an accelerator pedal of the vehicle.
In one embodiment, when the vehicle is an automatic transmission vehicle, the step S120 of releasing an accelerator pedal of the vehicle to keep the vehicle coasting at a reduced speed includes: the operation of releasing the accelerator pedal of the vehicle to keep the vehicle coasting at a reduced speed is performed in a neutral (N-range) state and a drive (D-range) state of the vehicle, respectively.
It should be noted that the pitch angle acquired during the braking test of the vehicle in the neutral (N-range) state can be used as the evaluation basis for the braking pitch performance of the vehicle.
The height variation of the front suspension and the rear suspension of the vehicle in the vertical direction, which is acquired during the braking test of the vehicle in the neutral (N-gear) state, can be used for judging the contribution of the front suspension and the rear suspension of the vehicle to the braking pitching performance of the vehicle, so that the braking pitching performance of the vehicle can be verified through the height variation of the front suspension and the rear suspension of the vehicle in the vertical direction.
The braking deceleration, the brake pedal force, the branch pump pressure and the total pump pressure of the vehicle, which are acquired during the braking test of the vehicle in the neutral gear (N gear) state, can be used as the basis for monitoring the change condition of the internal parameters of the braking system at the triggering critical moment of the braking system in the braking process of the vehicle.
The comparison results of the corresponding parameters acquired during the braking test of the automatic transmission vehicle in the neutral (N-gear) state and the driving (D-gear) state can be used for quantitatively evaluating the influence of the power output of the driving system of the automatic transmission vehicle on the braking pitching performance of the automatic transmission vehicle, and the method is particularly represented by whether the oil replenishing operation for preventing the driving system of the automatic transmission vehicle from extinguishing fire is reasonable when the gear-down strategy of the automatic transmission vehicle and the speed of the automatic transmission vehicle are zero.
Corresponding parameters acquired during a braking test of the automatic transmission vehicle in a driving gear (D gear) state can be used for quantifying the driving feeling of an after-sale market (common consumers) of the vehicle on the braking performance of the automatic transmission vehicle.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A vehicle braking performance evaluation method is characterized by comprising the following steps:
collecting brake test parameters, attitude response parameters and internal parameters of a brake system of a vehicle in a period from the start of braking to the stop of the vehicle when the vehicle performs a brake test;
establishing a corresponding relation among the brake test parameters, the attitude response parameters, the internal parameters of the brake system and time; and
quantitatively evaluating the braking performance of the vehicle based on the corresponding relation of the braking test parameters, the attitude response parameters and the internal parameters of the braking system at the same moment;
wherein the braking test parameters comprise at least one of state parameters and environmental site parameters, the attitude response parameters comprise at least one of a pitch angle, a height variation of the front suspension in the vertical direction and a height variation of the rear suspension in the vertical direction, the internal parameters of the brake system comprise at least one of brake deceleration, brake pedal force, wheel cylinder pressure and total pump pressure;
drawing curves of all parameters of the vehicle on the same coordinate system according to all the collected parameters of the vehicle so as to more clearly display the relation and the variation trend of all the parameters of the vehicle on the same time axis, wherein all the collected parameters of the vehicle are transmitted to terminal equipment for curve drawing;
the vehicle braking test method comprises the following steps:
accelerating the running vehicle to a first preset speed;
releasing an accelerator pedal of the vehicle to keep the vehicle in deceleration and coasting; and
increasing a brake pedal force applied to a brake pedal of the vehicle when the speed of the vehicle decreases from the first preset speed to a second preset speed until the vehicle stops;
the step of performing a braking test of the vehicle further comprises:
triggering an automatic control system of a braking system of the vehicle to perform operation before the speed of the vehicle is reduced from the second preset speed to a third preset speed;
when the vehicle is a manual transmission vehicle, the step S120 of releasing the accelerator pedal of the vehicle to keep the vehicle coasting at a reduced speed includes: s122, when the vehicle is in a neutral gear (N gear), the operation of releasing an accelerator pedal of the vehicle to enable the vehicle to keep decelerating and sliding is executed;
when the vehicle is an automatic transmission vehicle, the step S120 of releasing an accelerator pedal of the vehicle to keep the vehicle coasting at a reduced speed includes: the method comprises the following steps of respectively executing the operation of releasing an accelerator pedal of a vehicle to keep the vehicle in deceleration sliding under the condition that the vehicle is in a neutral gear (N gear) state and a driving gear (D gear);
the pitch angle acquired during the braking test of the vehicle in the neutral (N-gear) state can be used as the evaluation basis of the braking pitch performance of the vehicle;
the height variation of the front suspension and the rear suspension of the vehicle in the vertical direction, which is acquired during a braking test of the vehicle in a neutral (N-gear) state, is used for judging the contribution of the front suspension and the rear suspension of the vehicle to the braking pitching performance of the vehicle, so that the braking pitching performance of the vehicle is verified through the height variation of the front suspension and the rear suspension of the vehicle in the vertical direction;
the method comprises the steps that the braking deceleration, the brake pedal force, the branch pump pressure and the total pump pressure of a vehicle, which are acquired during a braking test of the vehicle in a neutral (N gear) state, are used as the basis for monitoring the change condition of internal parameters of a braking system at the triggering critical moment of the braking system in the braking process of the vehicle.
2. The vehicle braking performance evaluation method according to claim 1, wherein the step of collecting braking test parameters, attitude response parameters, and internal parameters of a braking system of the vehicle during a period from a start of braking to a stop of the vehicle when the vehicle is subjected to a braking test includes:
detecting at least one of a pitch angle, a pitch angle angular velocity, a vehicle body roll angle angular velocity, a vehicle body yaw angle and a vehicle body yaw angular velocity of the vehicle through a gyroscope; and/or
Detecting, by an altimeter system, an amount of height change of a front suspension and/or an amount of height change of a rear suspension of the vehicle in a vertical direction.
3. The vehicle braking performance evaluation method according to claim 1, characterized by further comprising, before the step of performing a braking test on the vehicle:
and carrying out a brake preheating test on the vehicle so as to enable a brake system of the vehicle to reach a working state of a preset standard.
4. The vehicle braking performance evaluation method according to claim 3, characterized in that the step of performing a brake warm-up test on the vehicle includes:
and enabling the vehicle to run at a preset initial speed and a preset braking deceleration until relevant structural members of a braking system of the vehicle reach a preset standard state.
5. The vehicle braking performance evaluation method according to claim 1, characterized by further comprising, before performing a braking test of the vehicle:
and checking whether the state of the vehicle meets the requirement of a braking test in advance.
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| CN112326260B (en) * | 2020-10-23 | 2022-12-09 | 上汽通用汽车有限公司 | Method for testing ride comfort of regenerative braking of vehicle |
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| CN113092127A (en) * | 2021-03-11 | 2021-07-09 | 东风柳州汽车有限公司 | Test method, device, storage medium and device for front collision early warning |
| CN113984402B (en) * | 2021-09-10 | 2023-07-18 | 中国人民解放军63966部队 | System and method for measuring braking deflection of vehicle |
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| CN115655740B (en) * | 2022-10-11 | 2024-01-05 | 深圳市易检车服科技有限公司 | Method and device for detecting vehicle braking performance, electronic equipment and storage medium |
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